Crocus is grown for its root. It's hardy across USDA zones 3 through 8 and grows just as well in a container as in the ground. Its summer flowers are a real draw for honeybees and native bees, even though the root is the prize.
Zones
3-8
pH Range
5.5-7.8
Sun
Full Sun
Days to Maturity
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Score Crocus on your exact land.
Zone averages can't see the slope, soil, frost, and sun that decide whether crocus actually takes — and those shift from one yard to the next. Enter your address and we'll score crocus against your land's real conditions.
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What Crocus is
Crocus reaches around 6 inches at maturity. It blooms in summer. It's also well suited to containers.
How to grow Crocus
Crocus grows in USDA zones 3 through 8. Crocus does best in full sun — at least 6 hours of direct sun a day — and soil from pH 5.5 to 7.8, on well-drained ground. It needs a growing season of at least 180 frost-free days, which is why climate matters as much as soil.
USDA Zones
3-8
USDA PHZM 2023
Soil pH
5.5 - 7.8
USDA PLANTS Database
Sun
Full Sun
plant_species_v5.csv
Drainage
well (dry spells)
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Frost Tolerance
39.2°F
plant_species_v5.csv
Mature Height
0.5 ft
plant_species_v5.csv
Frost-Free Days
180+
plant_species_v5.csv
Sow directly
Sow crocus seed straight into the bed — root crops germinate fast and resent transplanting. Give them full sun.
Match the soil
Crocus prefers pH 5.5 to 7.8 (USDA PLANTS Database). A quick soil test from your local Extension lab tells you whether to add lime or sulfur to land in band.
Water steadily
Keep the root zone evenly moist through establishment. A 2–3 inch mulch layer holds moisture without waterlogging.
Harvest at maturity
Pull while roots are young and tender — sweeter than oversized ones. Local Cooperative Extension guides publish timing tables.
Good to know
Good news for pet owners — crocus isn't known to be toxic to dogs or cats. (Source: ASPCA.)
Crocus is a standout pollinator plant — high value to bees and other pollinators. (Source: Xerces Society, Pollinator Partnership.)
Where Crocus thrives
Crocus is hardy across USDA zones 3 through 8. Zone is only the starting point, though: the soil pH, drainage, and frost dates on your specific land decide how well it actually does.
Zones 3–8·Where Crocus growsOpen map →
On USDA hardiness-zone overlap, Crocus can grow in these states:
See if Crocus will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether crocus actually takes — we score it against the real conditions at your address.
Three things about your exact spot that zone averages miss:
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
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Frequently Asked Questions
Can I grow Crocus in my zone?
Crocus grows in USDA hardiness zones 3 through 8 (USDA PHZM 2023). Zone is one factor — soil pH, drainage, and frost dates on your specific parcel also shape whether it takes.
When should you plant Crocus?
Most growers plant crocus after the last spring frost, once the soil has warmed, leaving enough of the season for its 180-day frost-free need. Your local frost dates set the exact window — a Growable Ground report reads them for your address.
How much sun does Crocus need?
Crocus needs full sun — a spot that catches at least 6 hours of direct summer sun a day. In more shade it still grows, but usually gives a smaller, later crop. The catch is that a yard rarely gets even light everywhere — a fence, the house, or one tall tree can quietly take those hours. A Growable Ground report reads the real sun-hours across your land, canopy and buildings included, so you can pick the brightest bed before you plant.
What soil does Crocus need?
Crocus prefers soil pH 5.5 to 7.8, on well-drained ground (USDA PLANTS Database). Your report scores your parcel's actual soil against that using USDA SSURGO data.
Does Crocus attract pollinators?
Yes — crocus's flowers are a strong nectar and pollen source for honeybees and native bees (Xerces Society, Pollinator Partnership).
Is Crocus safe for pets?
Crocus is not known to be toxic to dogs or cats based on available data (ASPCA). Always supervise pets around new plantings.